* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  background-color: #f5f5f5;
}

#app {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 480px;
  height: 80px;
  background: #c7c7c7;
  border: 1px solid #c7c7c7;
  border-radius: 10px;
  box-shadow: 4px 4px 4px #adadad;
  display: flex;
  overflow: hidden;
}

button {
  width: 150px;
  height: 100%;
  font-size: 40px;
  color: #ad2a27;
  cursor: pointer;
  border: none;
  outline: none;
  background: rgba(0, 0, 0, 0);
}

span {
  height: 100%;
  font-size: 40px;
  flex: 1;
  text-align: center;
  line-height: 80px;
  background: #fff;
}
